Sisteme AWD, care e cel mai bun? |
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Sisteme AWD, care e cel mai bun? |
Jun 4 2005, 02:14 PM
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specialist Group: Membri Posts: 4.583 Joined: 30-May 04 From: Honda World Member No.: 26.577 |
In 1980, Audi introduced the world to full-time all-wheel drive to volume-produced passenger cars. It was called quattro. Now in its fourth generation, Audi's quattro® permanent all-wheel drive directs power where and when it's needed. Under ideal conditions power is split 50/50 front to rear. But in extreme cases up to 67% of the engine's power can be directed to a single wheel. The benefits to the driver are safety, performance, power, and control in copious amounts. When cornering, all four wheels of a car must cover varying distances. The task of the center differential is to compensate for the differences between front and rear axles, and to distribute engine power between front and rear wheels. The center differential is the heart of Audi's permanent all-wheel driveline. Depending on the driving situation and road conditions, the system automatically regulates the distribution of power within milliseconds. This takes place by means of either (depending on model) the Torsen; differential, Haldex™ clutch, or hydraulic multi-plate clutch. Influencing parameters in the control process include engine speed and torque, wheel spreads, and longitudinal and lateral acceleration. The division of propulsive power between all four wheels is the basis of the excellent handling and safety of Audi models with quattro. The potential of this drive concept is further optimized by a series of control systems for brake and engine management: The Anti-lock Brake System (ABS) Electronic Brake-force Distribution (EBD) Electronic Differential Lock (EDL) Anti-Slip Regulation (ASR) All of the above assist in increasing traction when accelerating or braking. Furthermore, when cornering, the standard Electronic Stabilization Program (ESP) increases directional stability by comparing target and actual physical driving forces. The locking function of the center differential and the Electronic Differential Lock make sure that an Audi with quattro; all-wheel drive can still pull away with only one wheel able to transfer engine power to the road. Here's how it works: If one of the wheels on an axle loses grip and starts spinning, propulsive power has to be diverted to the other wheel by the axle's differential. Previously, a mechanical differential lock enabled this to take place. Now, the Electronic Differential Lock has replaced the mechanical lock, effectively transferring the excess power of the spinning wheel to the other wheels with better traction. On an Audi with quattro, if both wheels on an axle start spinning, the continuously controlled locking of the center differential ensures that most of the torque is transmitted to the other axle. In this way, propulsion is guaranteed in almost all situations. On an Audi with quattro, if both wheels on an axle start spinning, the continuously controlled locking of the center differential ensures that most ( adica 67%) of the torque is transmitted to the other axle. In this way, propulsion is guaranteed in almost all situations. dupa audiusa.com --------------------------------------------- cineva spunea ca diferenta intre 4motion si quattro este Haldex vs. Torsen. Se pare ca e inexact. Torsen este folosit pentru transmisia de la motoare dispuse longitudinal in timp ce Haldex este folosit pt. motoare dispuse transversal. -------------------- Civic Si 2007 2.0l DOHC iVTEC
Acura TL 2006 3.2l SOHC VTEC |
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Nov 21 2005, 05:37 PM
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Subaru Anti-Hero Group: Moderator Posts: 5.323 Joined: 13-May 04 From: F 1 World Member No.: 25.368 |
QUOTE(Valentin50014) Am sa revin cand timpul imi permite
Ajuta-ma tu sa intzeleg asa cum vrei tu. http://www.subaru-global.com/about/awd/poise/index.html Center Differential http://www.subaru-global.com/about/parts/06.html QUOTE Subaru's center differential contributes to performance for ideal traction for all four wheels by appropriately distributing the torque. Moreover, a racing driver noted, "Driving a car involves controlling the traction to all four wheels." Subaru's center differential regarded this as important function and actually achieved. The center differential is one of the main factors that enables AWD driving performance, which is responsive and superbly faithful to the driver's will.
The VTD of the Subaru Legacy is patented technology called "double-planetary gear type variable torque distribution." This VTD has a mechanism consisting of helical gears-- one front sun gear, one rear sun gear and three planetary gears, and one carrier. http://www.subaru-global.com/about/awd/per...ance/index.html Eu...is mai sarac si mai fraier -uite vezi recunosc - QUOTE Torque Distribution system.
Whether it's tackling a gravel-strewn FIA WRC special stage, or simply running into standing water on tarmac, keeping your car stable by getting the best possible traction is vital. That's where the technology of our torque distribution system sets Subaru apart from conventional 4-wheel drive set-ups. Evolved from the very outset specifically for Symmetrical AWD, it actively distributes engine torque to individual wheels - not just to front or rear axles, as some others do. In fractions of a second, our smart system automatically adjusts the amount of torque, giving maximum grip and stability wherever and whenever it's needed - not only in extreme conditions, but in everyday driving. The result is dynamic handling that feels truly intuitive, making the car behave like an extension of the driver's body and mind. So, even when road conditions change unexpectedly, torque distribution plays a crucial role in achieving the goal of stability and control. Maximum grip showcase LSD(Limited Slip Differential) LSD(Limited Slip Differential) At the very core of this complement to AWD stability is Subaru's centre limited slip differential. A sophisticated mechanism controls torque distribution and limits tyre slip pro-actively, rather than reactively, depending on the different surfaces you encounter along your journey. This real time adjustment makes sure that a Subaru always uses its AWD traction and stability to the full. But it's not just for slippery and adverse conditions either. So, while you may never see our central differential in the flesh, it's very reassuring to know that this marriage of technology and mechanical engineering is constantly working with all the other Subaru technologies, to keep your car more stable, and you safer. Este o mica animatzie care poatre te intereseaza http://www.subaru-global.com/about/awd/per...ance/index.html Maximum Grip Showcase - Corner & Wet Road M-am plictisit. Acum invatza-ma si tu ceva. Pe bune si cu toata seriozitatea. Eu sint confuz si pretind anumite chestii care nu sint adevarate...despre masina saracului. Daca eu am transmisie manuala...si intr-adevar nu am TOATE chestiile astea pe masina (asta imi este neclar) nu inseamna ca Subaru face sisteme AWD inferioare si de toata bafta cind le compari cu X-Drive sau QUATRO sau mai stiu eu ce. Din ce am citit...pe site-ul lor...si Subaru are pro-active, si cu timpi de reactzie in fractziuni de secunda. Exact aceleasi cuvinte folosite si in link-ul despre X-Drive de mai sus. intre timp ma duc sa cersesc niste bani de la locul de munca (este 8:30 AM )...ca doar eu sint sarac si nu am cum sa imi permit "opere de arta" ci doar masini similare statutului meu social. -------------------- Schumi drive it like you stole it !
2005 Subaru Legacy GT ; 2009 Subaru Forester XP ; 2014 Jeep Grand Cherokee |
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